query_question: A 40-ft^3 adiabatic container is initially evacuated. The supply line contains air that is maintained at 150 psia and 90°F. The valve is opened until the pressure in the container is the same as the pressure in the supply line. Determine the work potential of the air in this container when it is filled. Take T0 = 80°F.<image 1>
options: ['W=817Btu', 'W=917Btu', 'W=1017Btu']
demo_question_list: An insulated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of 175 kPa. Water is stirred by a paddle wheel while a current of 8 A flows for 45 min through a resistor placed in the water. If one-half of the liquid is evaporated during this constant-pressure process and the paddle-wheel work amounts to 400 kJ, determine the voltage of the source. Also, show the process on a P-v diagram with respect to saturation lines. <image 1>
  A. 204 V
  B. 224 V
  C. 244 V
  
  Answer with the option's letter from the given choices directly. The tank of liquid in the figure P2.139 accelerates to the right with the fluid in rigid-body motion. Compute a_x in m/s^2. <image 1>
  A. 1.00 m/s2
  B. 1.50 m/s2
  C. 1.28 m/s^2
  
  Answer with the option's letter from the given choices directly. The long pipe in Fig. 3.133 is filled with water at 20°C. When valve A is closed, p1 - p2 = 75 kPa. When the valve is open and water flows at 500 m^3/h, p_1 - p_2=160 kPa. What is the friction head loss between 1 and 2, in m, for the flowing condition? <image 1>
  A. 7.6 m
  B. 9.2 m
  C. 8.7 m
  
  Answer with the option's letter from the given choices directly. The 3-arm lawn sprinkler of Fig. P3.114 receives 20°C water through the center at 2.7 m^3/hr. If collar friction is neglected, what is the steady rotation rate in rev/min for $\theta $ = 40°? <image 1>
  A. 317 rev/min
  B. 414 rev/min
  C. 400 rev/min
  
  Answer with the option's letter from the given choices directly.